The influence of environmental factors on seasonal changes in bacterial cell volume in two prairie saline lakes

Tumber, Vijay; Robarts, Richard D.; Arts, Michael T.; Evans, Marlene S.; Caldwell, Douglas E.

doi:10.1007/bf00166025

Cited by 27 publications

(12 citation statements)

References 23 publications

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“…Bacterial numbers were high, ranging from 3.5 to 110×10 6 cells ml −1 with a mean of 26.3×10 6 cells ml −1 (±2.0×10 6 cells ml −1 95% CL) but the peak numbers were not associated with the die‐off of the summer cyanobacterial bloom. Mean bacterial cell volume was 0.083±0.021 μm 3 SD, which was not significantly different from the mean cell volume found in a nearby oligotrophic lake [32]. The data from Humboldt Lake, like those from Lake Rodó, do not support a trend of decreasing cell volume with increasing cell number (cf.…”

Section: The Significance Of Heterotrophic Bacteria In Hypertrophic contrasting

confidence: 62%

The significance of autotrophic and heterotrophic picoplankton in hypertrophic ecosystems

Sommaruga

Robarts²

2006

FEMS Microbiology Ecology

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Hypertrophic aquatic ecosystems are biologically important because they represent an environment where homeostatic mechanisms are strongly reduced and extreme oscillations occur in physical and chemical parameters as well as in the growth of many planktonic organisms. Hypertrophic lakes may represent not only the ultimate state of eutrophication, but also systems where abundance and production of picoplanktonic organisms (0.2–2 μm in diameter) may theoretically be greatest. In this review we examined the microbial ecology literature for studies on hypertrophic lakes and assessed the significance of heterotrophic bacteria (BACT) and autotrophic picoplankton (APP). Our main conclusions are as follows: (a) The relative contribution of APP to total phytoplankton biomass is strongly reduced in hypertrophic systems. (b) The absolute abundance and biomass of APP are highly variable among these systems; depending mainly on differences in light quality and quantity, the existence of nitrogen limitation and presence of pollutants. (c) The abundance of BACT does not increase as rapidly as algal biomass with increasing trophy. (d) A clear dichotomy exists between lakes dominated by Microcystis where bacterial biomass and production are relatively low, and Planktothrix‐dominated lakes where bacterial biomass and production are high. (e) Bacterial production per unit biomass tends to increase from oligotrophic to hypertrophic systems supporting the previous hypothesis that bacteria do not play a lesser role in lake metabolism at the upper end of the trophic scale. In general, however, our knowledge of the microbial ecology of hypertrophic systems has advanced very little since the 1980s, largely because most studies of these systems have focused on their remediation.

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Section: The Significance Of Heterotrophic Bacteria In Hypertrophic contrasting

confidence: 62%

The significance of autotrophic and heterotrophic picoplankton in hypertrophic ecosystems

Sommaruga

Robarts²

2006

FEMS Microbiology Ecology

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“…Thus, it could be concluded that the mean cell-length of planktonic bacteria in all these five watercourses studied, were controlled largely by environmental variables, which is in agreement with the other studies such as, low land water courses of northeast England [49], in a flooded Sep reservoir of France [26], in the hypertrophic Hamboldt Lake and Oligotrophic Redberry lake in Sasktchewan Canada [44], and in sediments of Botany bay in Sydney, Australia which is fed by two rivers, the Cooks river and the Georges river [31]. Further, the strength of the relationship between the overall mean cell-length of planktonic bacteria and environmental variables in the river Lakshmanatheertha with more correlations suggests that, environmental variables have retained a degree of bottom-up (nutrients) control of variation in bacterioplankton cellsize.…”

Section: Discussionsupporting

confidence: 90%

Bacterial (Free Living and Particle Bound) Cell- Size in the Surface Waters of River Cauvery and Its Upstream Tributaries in Karnataka State, India

Mahadevaswamy¹

2007

Appl Ecol Env Res

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Abstract. Cell-size here refers to mean length, as only the lengths of bacterial cells were measured in this study. Cell breadths were not measured, hence calculation of biovolume and biomass was not possible. In this study, the mean cell-lengths of heterotrophic bacterioplankton as well as their relation with environmental (water-quality) variables were analyzed for two years in the main river Cauvery and its four important upstream tributaries from February 2000 to January 2002. The initial hypothesis that all the five water courses have similar bacterial mean cell-lengths was rejected, because mean cell-lengths of free living and particle bound planktonic bacteria was more and was also significantly different in the river Lakshmanatheertha, when compared to the other four water courses studied. Season-wise grouped data revealed that, the mean cell-length of free-living bacteria was significantly less in winter season as compared to rainy and summer seasons during the second year of study only in the river Lakshmanatheertha. A correlation (r) analysis between the mean cell-lengths of heterotrophic bacteria and environmental (water-quality) variables revealed significant relations. Also with the help of regression analysis (r 2 ) the effect of some important environmental variables on the mean cell-length of heterotrophic bacteria has been discussed in the light of recent investigations in the field of fresh water microbial ecology.

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“…The obvious conclusion is that, though the heterotrophic bacterial mean cell length was similar in all the fi ve watercourses, different sets of environmental variables apparently controlled cell size in the different water bodies studied. Similar observations were made for the hypertrophic Humboldt lake and oligotrophic Redberry lake in Saskatchewan, Canada (Tumber et al 1993), in a recently fl ooded oligomesotrophic reservoir in France (Jugnia et al 2000) and in sediments of Botany Bay in Sydney, Australia, which is fed by two rivers-the Cooks and the Georges rivers (Lee and Patterson 2002).…”

Section: Discussionsupporting

confidence: 65%

Heterotrophic free-living and particle-bound bacterial cell size in the river Cauvery and its downstream tributaries

2007

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This is the first comprehensive study on planktonic heterotrophic bacterial cell size in the river Cauvery and its important tributaries in Karnataka State, India. The initial hypothesis that the mean cell size of planktonic heterotrophic bacteria in the four tributaries are markedly different from each other and also from that in the main river Cauvery was rejected, because all five watercourses showed similar planktonic heterotrophic bacterial cell size. Examination of the correlation between mean heterotrophic bacterial cell size and environmental variables showed four correlations in the river Arkavathy and two in the river Shimsha. Regression analysis revealed that 18%of the variation in mean heterotrophic free-living bacterial cell size was due to biological oxygen demand (BOD)in the river Arkavathy, 11% due to surface water velocity (SWV)in the river Cauvery and 11% due to temperature in the river Kapila. Heterotrophic particle-bound bacterial cell size variation was 28% due to chloride and BOD in the river Arkavathy, 11% due to conductivity in the river Kapila and 8% due to calcium in the river Cauvery. This type of relationship between heterotrophic bacterial cell size and environmental variables suggests that,though the mean heterotrophic bacterial cell size was similar in all the five water courses, different sets of environmental variables apparently control the heterotrophic bacterial cell size in the various water bodies studied in this investigation. The possible cause for this environmental (bottom -up) control is discussed.

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The influence of environmental factors on seasonal changes in bacterial cell volume in two prairie saline lakes

Cited by 27 publications

References 23 publications

The significance of autotrophic and heterotrophic picoplankton in hypertrophic ecosystems

The significance of autotrophic and heterotrophic picoplankton in hypertrophic ecosystems

Bacterial (Free Living and Particle Bound) Cell- Size in the Surface Waters of River Cauvery and Its Upstream Tributaries in Karnataka State, India

Heterotrophic free-living and particle-bound bacterial cell size in the river Cauvery and its downstream tributaries

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